microsoft/TypeScript

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TypeScript is a superset of JavaScript that compiles to clean JavaScript output.

Stars: 111k
Forks: 14.3k
Open beginner issues: 18
Indexed issues: 4.9k
Avg merge: 2d 4h
Merged PRs (30d): 132

Dominant language: Go
License: Apache-2.0
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted good first issue

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4,857 open issues indexed

Property is not assignable to the same property in generic base type Open

Bug Domain: check: Variance Relationships Help Wanted

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/TypeScript#61918 · 2 comments · Opened Jun 23, 2025
Preserve computed property in `--isolatedDeclarations` emit Open

Bug Domain: flag: isolatedDeclarations Help Wanted

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/TypeScript#61892 · 6 comments · 6 reactions · Opened Jun 18, 2025
Namespaces: use before declaration is not reported Open

Bug Domain: check: Control Flow Help Wanted

microsoft/TypeScript#61891 · 4 comments · 3 reactions · 1 assignee · Opened Jun 18, 2025
Comparing arrays doesn't give any error Open

Awaiting More Feedback Suggestion

Difficulty 4/5 3-5 days Newbie friendliness 28/100

microsoft/TypeScript#61889 · 4 comments · Opened Jun 18, 2025
__esDecorate transpiled code uses "Symbol" even of this is shadowed by a local variable Open

Bug Domain: Decorators Help Wanted

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/TypeScript#61884 · Opened Jun 17, 2025
Type Guard Documentation Is Incorrectly Labeled as Deprecated Open

Docs Help Wanted

Difficulty 1/5 Under an hour Newbie friendliness 45/100

microsoft/TypeScript#61881 · 6 comments · Opened Jun 16, 2025
Comment like jsx text emitted twice when preserve enabled Open

Bug Domain: JSX/TSX Help Wanted

Difficulty 3/5 1-2 days Newbie friendliness 42/100

microsoft/TypeScript#61860 · 1 comment · Opened Jun 13, 2025
Way to detect whether a callable has type parameters Open

Awaiting More Feedback Suggestion

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/TypeScript#61838 · 1 reaction · Opened Jun 10, 2025
The second parameter type of `apply` should be `ArrayLike<T>` instead of `T[]` Open

Domain: lib.d.ts Help Wanted Possible Improvement

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

microsoft/TypeScript#61835 · 1 comment · 1 reaction · Opened Jun 9, 2025
Pipe Operator instead of conditions and deep extends Open

Awaiting More Feedback Suggestion

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/TypeScript#61819 · 4 comments · Opened Jun 5, 2025
Inconsistency involving discriminated union and flatMap Open

Experimentation Needed

microsoft/TypeScript#63776 · 4 comments · 1 reaction · 2 assignees · Opened Jun 4, 2025
Misleading error for a generic parameter with a default involving `this` Open

Domain: This-Typing Help Wanted Possible Improvement

Difficulty 5/5 Over a week Newbie friendliness 30/100

microsoft/TypeScript#61812 · Opened Jun 4, 2025
Commit characters are not reset inside typescript object property key strings Open

Strada (TS 6.0-) Language Service

Difficulty 3/5 1-2 days Newbie friendliness 35/100

microsoft/TypeScript#62161 · 8 comments · Opened Jun 2, 2025
`tsBuildInfoFile` is not extendable. Add an alternative `tsBuildInfoDir` option Open

Awaiting More Feedback Suggestion

Difficulty 5/5 Over a week Newbie friendliness 30/100

microsoft/TypeScript#61794 · 6 reactions · Opened Jun 1, 2025
Cannot assign Uint8Array type to Uint8Array variable created with constructor Open

Needs Investigation

microsoft/TypeScript#61793 · 6 comments · 1 reaction · 1 assignee · Opened Jun 1, 2025
Parameters in functions with type parameters are not contextually-typed Open

Needs Investigation

microsoft/TypeScript#61791 · 1 assignee · Opened Jun 1, 2025
"Used before initialization" error false positives and negatives with optional properties Open

Bug Domain: check: Control Flow Help Wanted

microsoft/TypeScript#61785 · 1 comment · 1 assignee · Opened May 30, 2025
Function implementation name must be ... (2389) when abstract method is declared again later Open

Domain: Error Messages Help Wanted Possible Improvement

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/TypeScript#61783 · 3 comments · Opened May 29, 2025
ReturnType is lost after a simple wrapper function Open

Needs More Info

Difficulty 4/5 3-5 days Newbie friendliness 38/100

microsoft/TypeScript#61780 · 1 comment · Opened May 29, 2025
Allow narrowing of unions discriminated by numeric literals using `>` `<` etc Open

Awaiting More Feedback Suggestion

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/TypeScript#61770 · 7 comments · Opened May 27, 2025
[DTS] Object literal method with bigint is omitted in generated `.d.ts`, but class method works correctly Open

Bug Domain: Declaration Emit Help Wanted

microsoft/TypeScript#61769 · 1 assignee · Opened May 27, 2025
`IntegerTypedArray` type required for use with `crypto.getRandomValues` Open

Bug Domain: lib.d.ts Needs Human Review

microsoft/TypeScript#61768 · 2 comments · 2 reactions · 3 assignees · Opened May 27, 2025
Inlay hints will be disabled after extending constructor function in Mixin Implementation using Typescript Open

7.0 LS Migration Bug Domain: LS: Inlay Hints

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/TypeScript#62023 · 8 comments · Opened May 24, 2025
[BUG] This JSX tag requires the module path 'react/jsx-runtime' to exist, but none could be found. Make sure you have types for the appropriate package installed. Open

Needs More Info

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/TypeScript#61756 · 10 comments · 2 reactions · Opened May 22, 2025
Tuples: maintaining type-param in the type of it's items Open

Experimentation Needed Suggestion

Difficulty 5/5 Over a week Newbie friendliness 35/100

microsoft/TypeScript#61750 · 3 comments · 1 reaction · Opened May 22, 2025
Intersection with a mapped type breaks bypassing private assignability. Open

Domain: Intersection Help Wanted Possible Improvement

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/TypeScript#61743 · Opened May 21, 2025
Mixing base class defeats circularity protection Open

Domain: check: Type Circularity Help Wanted Possible Improvement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/TypeScript#61721 · Opened May 18, 2025
Double initializing a `readonly` field should not be allowed Open

Awaiting More Feedback Suggestion

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/TypeScript#61716 · 4 comments · 3 reactions · Opened May 17, 2025
`using` transform throws when a for body binding shadows the for head binding Open

Bug Domain: API: Transforms Help Wanted

microsoft/TypeScript#61714 · 6 comments · 1 reaction · 1 assignee · Opened May 16, 2025
Add option to remove "move to new file" quick fix Open

Needs Investigation Visual Studio

microsoft/TypeScript#61712 · 1 comment · 2 reactions · 1 assignee · Opened May 16, 2025
Resolution order dependent circular heritage Open

Domain: check: Type Circularity Help Wanted Possible Improvement

Difficulty 5/5 Over a week Newbie friendliness 35/100

microsoft/TypeScript#61711 · Opened May 16, 2025
`Object.groupBy` should not return `Partial<Record<string, T>>` or `Partial<Record<number, T>>` Open

Awaiting More Feedback Suggestion

Difficulty 3/5 1-2 days Newbie friendliness 56/100

microsoft/TypeScript#61706 · 7 comments · 11 reactions · Opened May 15, 2025
Internal caching of Iterable types skips type checks for optional Arrays, only emits error on first encountered instance of TS error 2488 Open

Bug Domain: Error Messages Help Wanted

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/TypeScript#61698 · Opened May 13, 2025
This JSX tag's 'children' prop expects type 'string' which requires multiple children, but only a single child was provided Open

Needs Investigation

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/TypeScript#61692 · 5 comments · 2 reactions · Opened May 12, 2025
The entries collection in observers should be non-empty Open

Experience Enhancement Help Wanted Suggestion

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

microsoft/TypeScript#61691 · Opened May 12, 2025
Generic TypedArray constructors have only one overload Open

Domain: lib.d.ts Help Wanted Possible Improvement

Difficulty 3/5 1-2 days Newbie friendliness 42/100

microsoft/TypeScript#61680 · 3 comments · Opened May 9, 2025
A contextually-typed signature coming from correlated union can't be assigned back to source of its contextual type Open

Domain: check: Contextual Types Help Wanted Possible Improvement

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/TypeScript#61676 · Opened May 8, 2025
Custom JSDoc type cannot be extended Open

Needs Proposal Suggestion

microsoft/TypeScript#62021 · 7 comments · 1 assignee · Opened May 8, 2025
public static fields without initializer are removed even with `useDefineForClassFields=true` Open

Needs Investigation

microsoft/TypeScript#61671 · 1 assignee · Opened May 8, 2025
Omit JSDoc type directives when emitting type declarations with documentation Open

Awaiting More Feedback Suggestion

Difficulty 5/5 Over a week Newbie friendliness 35/100

microsoft/TypeScript#61664 · 1 reaction · Opened May 6, 2025
VS Code doesn't show autocomplete for Mongoose MongoDB operators (like $elemMatch, $match,$gte and ...) in JavaScript, while WebStorm does Open

Domain: LS: Completion Lists Experience Enhancement Help Wanted Suggestion

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/TypeScript#61666 · 4 comments · Opened May 6, 2025
Tsserver never picks up a new file Open

Needs More Info

Difficulty 4/5 3-5 days Newbie friendliness 25/100

microsoft/TypeScript#61663 · 1 comment · Opened May 6, 2025
Support the `@private` JSDoc directive to exclude private APIs from emitted type declarations Open

Awaiting More Feedback Suggestion

Difficulty 5/5 Over a week Newbie friendliness 28/100

microsoft/TypeScript#61651 · 2 comments · Opened May 4, 2025
Broken inference for generic classes passed to a generic function taking an optional class Open

Needs Investigation

microsoft/TypeScript#61633 · 4 comments · 1 assignee · Opened Apr 30, 2025
typescript auto import includes from `node_modules` Open

Needs More Info

Difficulty 4/5 3-5 days Newbie friendliness 32/100

microsoft/TypeScript#61634 · 1 comment · Opened Apr 30, 2025
Intellisense for import.meta.resolve() Open

Awaiting More Feedback Suggestion

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/TypeScript#61631 · 1 comment · Opened Apr 29, 2025
Prefer local auto-imports over those from external modules Open

Needs Investigation

microsoft/TypeScript#61617 · 1 comment · 1 assignee · Opened Apr 25, 2025
Add option to always inline .json type import Open

Awaiting More Feedback Suggestion

Difficulty 5/5 Over a week Newbie friendliness 35/100

microsoft/TypeScript#61614 · 1 comment · Opened Apr 25, 2025
Unexpected circularity error when variable is initialized from a class member Open

Bug Domain: check: Type Circularity Help Wanted

Difficulty 4/5 3-5 days Newbie friendliness 42/100

microsoft/TypeScript#61606 · 4 comments · Opened Apr 22, 2025
Exclude specific exported identifiers from auto import suggestions Open

Awaiting More Feedback Suggestion

Difficulty 5/5 Over a week Newbie friendliness 35/100

microsoft/TypeScript#61605 · 1 comment · 3 reactions · Opened Apr 22, 2025

microsoft/TypeScript

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